(Francisco Kjolseth | The Salt Lake Tribune) The Bonneville Salt Flats, comprised of mostly sodium chloride that forms a hard, white salt crust and home to numerous land speed records, are covered in nine inches of water, forming a shallow lake on Friday, Jan. 27, 2023. The flats are flooded with brine every winter in an effort to get them to regrow, but recent research found the experiment may make things worse.